Door stile lock and latch bolt assembly

ABSTRACT

A door stile bolt pivotally mounted on a lock containing cylinder and having bolt latching mechanisms interrelated with the lock for direct action by the latter for release and rotary movement of the bolt about the lock and cylinder between two extreme positions of locked and unlocked condition. The assembly of such bolt and lock containing cylinder within a recess formed within the door stile with a minimal exposure of the lock within the cylinder at the outer side of the stile and means for protecting the bolt and interrelated mechanisms between the bolt and lock against tampering and for affixing the cylinder containing the lock relative to the door stile.

Crepinsek 1 June 26, 1973 DOOR STlLE LOCK AND LATCH BOLT ASSEMBLY [75] Inventor: Alois Creplnsek, San Jose, Calif.

[73] Assignee: Security Technology Corporation, San Jose, Calif.

[22] Filed: Dec. 22, 1971 [21] Appl. No.: 210,813

Primary Examiner-Albert G. Craig, Jr. Attorney-Leslie M. Hansen [57] ABSTRACT A door stile bolt pivotally mounted on a lock containing cylinder and having bolt latching mechanisms interrelated with the lock for direct action by the latter for release and rotary movement of the bolt about the lock and cylinder between two extreme positions of locked and unlocked condition. The assembly of such bolt and lock containing cylinder within a recess formed within the door stile with a minimal exposure of the lock within the cylinder at the outer side of the stile and means for protecting the bolt and interrelated mechanisms between the bolt and lock against tampering and for affixing the cylinder containing the lock relative to the door stile.

10 Claims, 8 Drawing Figures PMENTED JUHZB I973 sazmnr mw w.

PATENIEI] M26 I913 3. 740.979

Prams:

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INVENTOR. A. CREP/NSEK /3 ATTORNEY DOOR STILE LOCK AND LATCH BOLT ASSEMBLY BACKGROUND This invention relates to a combined Lock and Bolt assembly and particularly to a lock and latch bolt assembly in combination with a closure member for an opening in enclosed area.

The general arrangement of a lock and latch bolt assembly for insertion into a mortised slot in the edge of a door and the like is well known in the art. In general, most of such known assemblies include a sliding bolt although pivoted bolts are also of common knowledge. In such prior type arrangements, the lock proper is usually adjacent the bolt of the sliding type or axially offset relative to the pivoted type.

In present day use of double door closures it is common to have the bolt extend between stiles of two swinging doors when they meet, one door being secured from within the enclosed area by a fixed interior slide bolt at the floor and head while the door having the lock in its stile is secured by the extended bolt. As a rule, such prior known lock and bolt assemblies are easily picked and vulnerable to break-in or removal.

STATEMENT OF INVENTION The present invention seeks to overcome the foregoing deficiencies and contemplates the provision of a lock and bolt completely concealed and guarded within a door stile and the'utilization of the latter as an element of the combination for supporting a cylinder type lock and to provide an axial pivot for the bolt.

More specifically it is an object of this invention to provide a lock and latch bolt assembly in which a barrel type lock is confined within a cylinder having its ends supported in aligned openings formed through inner and outer faces of a door stile and providing a pivot for a bolt interrelated with the barrel lock for swinging movement thereby between extended locked, and retracted, unlocked positions relative to the door stile.

It is another object to provide such a lock and latch bolt assembly with a protective chassis for embracing the latch bolt and its interrelated portion of the barrel lock. In this connection it is a further object that the protective chassis be keyed to the cylinder confining the barrel lock to further support the cylinder as a fixed shaft about which the bolt is tumable.

It is another object to provide such a lock and latch bolt assembly for a hollow metal door stile having an opening formed in that edge thereof adapted to face and meet with a fixed doorframe or mating door, the invention residing in the assembly so constructed as to admit the latch bolt through such opening for receipt of the lock confining cylinder inserted through aligned orifices in the inner and outer walls of the door stile. In connection with this object it is a further object to provide the protective chassis admissible through such opening and keyed connection with the lock containing cylinder and means for securing such chassis to the back wall of the door stile.

It is yet another object to provide such a protective chassis with side plates secured in spaced relation to embrace the latch bolt and means on said plates and the lock containing cylinder for securing and mounting the latter in fixed relation to the door stile and against axial movement relative-thereto.

These and other objects and advantages of the present invention will become apparent from a reading of the following description in the light of the accompanying three sheets of drawing in which:

FIG. 1 is a fragmentary elevational view of a pair of door stiles having the lock and bolt embodiment of the present invention therebetween;

FIG. 2 is an exploded perspective view of the principal components A-B-C-D and E embodied in the present invention;

FIG. 2D is a longitudinal section through a protective chassis D forming a part of the assembly of FIG. 2;

FIG. 2 BC is an elevational view through the bolt B and lock cylinder C forming a subassembly in accordance with the present invention;

FIG. 3 is a perspective view of parts A-B and C of FIG. 2 about to receive part D.

FIG. 4 is a perspective view similar to that of FIG. 3 assembled and about to receive part B;

FIG. 5 is a horizontal section through the lock and bolt arrangement of the present invention taken along line 55 in FIG. 1, turned 90 clockwise and a larger scale with respect thereto; and

FIG. 6 is a vertical section through FIG. 5 taken substantially along line 6-6 therein.

GENERAL DESCRIPTION Referring to the drawings, and particularly to FIGS. 1, 5, and 6 thereof, the present invention comprises a lock and bolt assembly 10 in combination with a pair of doors or a door stile and door jamb as the case may be. For purposes of explanation the lock and bolt assembly is equally adapted for use in locking a door 12 across its meeting line M with a fixed member 13 which may be a door jamb or another hinged door adapted to be secured in fixed relation to a door opening by slide bolts and the like in a conventional manner. In FIG. 1 of the present disclosure the meeting line M is shown to be between the stiles 14 and 15 of a pair of doors 12 and 13 respectively. In this arrangement the stile 15 of the fixable member 13 has a recess 16 formed in one edge thereof facing the meeting line M to receive a lock bolt B. The stile 14 of the other member, door 12, is mortised out as at 17 to receive the lock and bolt assembly 10 in accordance with the present invention.

DETAILED DESCRIPTION Referring now to FIG. 2 of the drawings the principal elements in the embodiment of the present invention comprises the stile A of a door 12, mortised or hollowed as at 17 in one edge to receive a bolt B adapted for pivotal mounting on a cylinder C supported by the door stile and confining a barrel type lock L; a chassis D for surrounding the bolt and lock barrel within the stile A; and an escutcheon plate E for closing the mortise 17 in the meeting edge of stile A.

As best seen in FIG. 2 the door stile A is preferably of hollow metal structure and of conventional configuration. For purposes of the present disclosure the stile A may be said to consist of extruded or preformed hollow metal tubing 18 having a substantially square or rectangular cross section for receiving the lock and bolt assembly. This tubular stile 18 thus formed has inner and outer sides 19 and 20, respectively, formed integrally with an edge 21 at the meeting line M and a back wall 22 diametrically opposite the latter.

Access to the mortise 17 within the hollow tubing 18 of the stile A is afforded by the provision of an opening 23 formed in the meeting edge 21 thereof. Additional openings 24 and 25 are formed on opposite inner and outer sides 19 and 20, respectively, of the tubular door stile 18. These openings 24 and 25 are axially aligned crosswise the stile A to receive and have snug fit with the ends of the cylinder C confining the barrel type lock L.

The lock L may be anyone of the well known barrel type lock such as is shown and described in my U. S. Pat. No. 3,393,542 or 3,413,831 arranged within the cylinder C. Such barrel type locks L have a bolt actuating lever 26 rotatable with the barrel within the cylinder C upon operation by the proper coded key. As best seen in FIGS. 2, and 6 such lever 26 extends radially from the lock barrel through a segmental slot 27 (FIG. 2 B-C) formed in the Cylinder C. It will therefore be noted that the lever 26 is of a length to extend beyond the perimeter of the cylinder C sufficiently to engage an actuating mechanism 45 within the bolt B in a manner later to be explained. Due to the extended length of the lever 26 beyond the cylinder C the opening 24 in the inner side wall 19 of the stile A is of slightly greater diameter than the other opening 25 in the outer side wall 20. By this means although one end 28 of the cylinder C fits snuggly into the opening 25, the opposite end of the cylinder C is threaded to have a threaded annular flange 29 applied thereto for axial support in and on the inner wall 19 of the stile A.

Before the cylinder C is applied to the door stile A, as aforementioned, the bolt B must be placed within the hollow mortised area of the stile A via the opening 23 for positioning between the aligned openings 24 and 25. As shown in FIGS. 2 and 3 the bolt B is provided with an opening 30 bored to receive the cylinder C for rotary movement of the bolt about the latter. The opening 30 is formed in the Bolt B transversely across its narrower dimension or thickness midway its width and equidistant from one end 31 of the bolt B. The end 31 of the bolt has one quadrant thereof rounded as at 32 radially of the center of the opening 30 to enable swinging movement of the bolt B within the recess 17 of the hollow tube 18 and between two limits of movement, i.e., locked and unlocked condition. The rounded portion 32 extends beyond the quadrant toward a guideway 44 formed midway the ends of the bolt B (FIG. 2 B-C and transversely of the latter. The arrangement is such that the bolt B can be positioned within the hollow tubing 18 via the opening 23 in the meeting edge 21. The bolt is positioned with the opening 30 thereof aligned axially with the two openings 24 and 25 in the side walls 19 and of the stile A. The cylinder C is then inserted into the stile A via the larger diametered opening 24 and through the opening 30 in the bolt B. The end 28 of the cylinder is then fit snugly into the opening in theopposite, outer side wall 20 of the stile A. Thereafter the protective chassis D is inserted into the recess 17 of the tube 18 via the opening 23 in the meeting edge 21 of the stile A.

The protective chassis D is a heavy steel case adapted to surround the bolt B and to provide a fixed support for the cylinder C axially of the openings 24 and 25 in 'the respective side walls 19 and 20 of the stile A. To

this end the chassis D consists of a pair of side plates 33 and 34 secured together and in spaced relation a distance comparable to the thickness of the bolt B plus a slight clearance therefrom. The plates 33 and 34 are secured together adjacent their front edges by upper and lower cross webs 35 and 36, respectively, by peg and peened connections 37. The back edges of the plates 33 and 34 are secured in like spaced relation by cross pins 38 and 39 spaced vertically sufficient to be non-obstructive to the bolt B.

Each of the side plates 33 and 34 have comparable slots 40 and 41, respectively, formed therein from their rear edges and in a plane registerable with the cylinder C. The upper and lower edges of these slots 40 and 41 are spaced a distance slightly less than the diameter of the cylinder C. The cylinder C is provided with a pair of upper and lower segmental grooves 42 and 43, each of which is spaced lengthwise the cylinder to receive the upper and lower edges of the slots 40 and 41 of the plates 33 and 34, respectively. These segmental grooves 42 and 43 are milled into the cylinder C at radial positions to orient the barrel lock L, its lever 26, and the segmental slot 27 in the cylinder C with the latch mechanisms 45 associated with the bolt B. (FIG. 2B-C).

By the foregoing arrangement the chassis D is adapted to slidably fit into the recess 17 with the side plates 33 and 34 disposed to support and affix the cylinder C in non-rotative axial alignment with the openings 24 and 25 in the stile A. The chassis D is secured to the stile A by means of two long bolts 46 and 47 extending through the upper and lower cross webs 35 and 36 for threaded connection at tapped bores 48-49 in the back wall 22 of the tubular form 18 of the stile A. It should here be noted that the back edges of the side plates 33 and 34 of chassis D have notches 50 and 51 formed therein (FIGS. 2D and 6) which fit against ribs 52 and 53, respectively, formed on the back wall 22 of the stile A.

Once the chassis D is thus secured, the opening 23 in the meeting edge 21 of the stile A is covered by the escutcheon plate E (FIGS. 5 and 6). The escutcheon plate E is secured to the cross webs 35 and 36 by suitable countersunk screws 35' and 36, respectively. The escutcheon plate E has an opening 23 formed therein approximately the length and thickness of the bolt B to allow the latter to swing into and out of the recess 17 between locked and unlocked condition.

These cross ribs 52 and 53 are spaced a distance from each other within the width of the bolt B such as to cooperate with the latch mechanism 45 on the bolt. As best seen in FIG. 2B-C the latch mechanism 45 includes two spring loaded latching means 54 and 55 for holding the bolt in either of its limits of movement, i.e., locked or unlocked condition. The latching means 54 is for holding the bolt in retracted, unlocked condition and the latching means 55 is for holding the bolt in extended, door locking condition.

The means 54 for latching the bolt in unlocked condition consists of a slide bar 56 arranged for sliding movement crosswise the width of the bolt B in the transverse guideway 44 formed in the latter. The slide bar 56 is urged by a compression spring 57 toward the back wall 22 of the tubular stile member 18. The aft end of the slide bar 56 is provided with a cam edge 58 in the region of the guideway 44 for the slide bar 56. Above the cam edge 58, the aft end of the slide bar 56 is provided with a notch 59 adapted to fit the upper cross rib 52 for latching the bolt B in unlocked condition, parallel to and in vertical position within the hollow recess 17 formed by the stile A.

The slide bar 56 has a lateral extension adjacent its spring loaded end disposed for engagement by the lever 26 of the lock L. Upon operation of the lock barrel L by a key, the lever 26 is free to turn with the barrel (clockwise FIG. 2 B-C) relative to the cylinder C. This depresses the spring 57 as the slide bar 56 is shifted away from the back wall 22 of the stile A. The notched end 59 of the slide bolt 56 is thus withdrawn from latched engagement with the cross rib 52 so that the entire bolt A will turn about the axial cylinder C by action of the lever 26 toward locked condition (FIGS. 2 B-C and 6). The bolt A therefore assumes horizontal condition with its free end extending laterally beyond and across the meeting line M into the keeper recess 16 of an adjacent door or fixed jamb member 13. At this position the latching means 55 becomes effective to lock the bolt in extended, door locking condition.

The latching means 55 as best seen in FIG. 2 B-C is a sickle or dog-leg shaped lever 60 pivotally mounted as at 61 on one side of the quadrantal portion 32 of the bolt B. The lever 60 is shaped to conform to and be confined within the rounded edge of the quadrant 32. The pivotal connection 61 of lever is substantially midway the quandrant 32. From the quadrant 32, one end 62 of the lever 60 extends toward the opposite squared corner 63 of the bolt B short of abutment with an extension of the edge 64 of the bolt. The end 62 of the lever 60 is engaged by a compression spring 65 seated in a recess 66 formed in the bolt B for urging the lever 60 in a direction (clockwise FIG. 2 B-C). The opposite end of the lever 60 is widened to engage the centrally located cylinder C for limiting pivotal movement of lever 60 under influence of spring 65 beyond curved confinement within the quadrantal edge 32 of the bolt The end 62 of lever 60 is notched as at 67 on that side thereof opposite its engagement by the compression spring 65. By this arrangement when the bolt B is turned into locking condition as shown in FIG. 6 the notched end 67 of the lever 60 snaps into latched engagement against the lower cross rib 53 on the back wall 22 of the stile A. The bolt B is thus latched in locked condition.

To open the lock, i.e., return the bolt B to unlocked condition, the lock barrel L must be turned anticlockwise (FIG. 6) by the use of a proper key. Thus the lever 26 connected to the lock barrel L is rotated with the latter relative to the cylinder C. This moves the lever 26 into engagement with a cam edge 68 on the widened end of the lever 60 of the latching means 55. It should here be noted that when the bolt B is disposed in locked condition, FIG. 6, the widened end of the lever 60 is in a segment of the quadrant 32 which is not within the hollow of the tubular stile A, free and clear of the back wall 22 of the latter. Note also that the pivotal connection 61 of the lever 60 is so disposed that the widened end of lever 60 may swing beyond the perimeter of the quandrantal edge 32 of the bolt B in locked condition. Consequently, when the lever 26 of the lock barrel L is forced against the cam edge 68 of the lever 60, the I opposite end 62 of the latter is forced against the compression spring to depress the latter. The notched end 67 of the lever 60 is thereby withdrawn from latched engagement with the lower cross rib 53 (FIG. 6) to unlock the bolt B for turning movement into unlocked condition as influenced by the turn of the key and action of the lever 26. When the extended end of the bolt B assumes vertical, retracted position within the hollow of the tubular stile A, the cam edge 58 on the notched end 59 of the slide bar 56 again engages the upper cross rib 52 on the back wall 22 of the stile A. Thus the slide bar 56 is urged back against its compression spring 57 until the notch 59 snaps into latching engagement with the cross rib 52 to hold the bolt B in unlocked condition.

By the foregoing arrangement it will be noted that the entire lock and bolt assembly 10 is confined within the mortised recess 17 in the door stile A. Moreover, the bolt B and lock bearing cylinder C are well guarded and supported by the surrounding heavy steel chassis D. The chassis D cooperates with the stile A in supporting the cylinder C, trunnion fashion, as a pivotal supporting axis for the bolt B. Note also in FIG. 5 that the outer end 28 of the cylinder C fits snuggly in the opening 25 in and flush with the outer face of the side wall 20 of the stile A (FIG. 5). It will therefore be appreciated that no tool or instrument can be used to pry the lock barrel L or cylinder C out of the opening 25 in the outside wall 20 of the stile.

As a further prevention against illegal entry, the bolt B is provided with means 70 within the bolt for deterring or discouraging any sawing action therethrough, especially across the meeting line M (FIG. 5). The means 70 may include one or more elements of harder or softer metal as the case may be. For example, each edge of the bolt B, FIGS. 3 and 4 may have a hard steel 'roller 71 rollably supported in a socket formed therein.

Such roller 71 may be of chrome steel and of such characteristic that any saw tooth engaging the same would merely cause the roller to rotate within its socket and prevent the saw teeth from taking bite into the bolt proper. Another such element may be a series of soft lead plugs 72 strategically placed crosswise the bolt B and embedded therein. These soft metal plugs 72 may be of lead or similar material which has a tendency to scale off and to compact between the teeth of a hack saw. A saw blade thus compacted becomes ineffective and blade after blade would have to be used before any through cut could be accomplished.

Having thus described mynew lock' and bolt assembly in specific detail it will be appreciated that the same may be susceptible to alternations, variation and/or modifications without departing from the spirit or scope of the appended claims in which I claim:

1. In a closure member, in a wall opening, including a stile having one recessed edge adapted for abuttment with a fixed member provided with a keeper recess for receiving a bolt extending laterally across the meeting line between the stile and fixed member; the combination therewith of a lock and latch bolt assembly comprising:

l. a pair of aligned bores formed through the inner and outer sides of the stile transversely of the recess therein:

2. a bolt having a bore formed crosswise its narrower thickness and concentric to one end thereof disposed in the recessed stile in axial alignment with said pair of aligned bores in the stile; and

3. a lock containing cylinder extending through the bore in said bolt and having each of its ends disposed in a respective one of the axially aligned bores in said stile and fixed thereto for .pivotally supporting said bolt means interconnecting the lock and bolt whereby actuation of the lock causes turning movement of the bolt between limits of vertical, unlocked condition within the recessed stile and horizontal, locked condition extending laterally across the meeting line and into the keeper recess of the fixed member.

2. The lock and bolt assembly in accordance with that of claim 1, in which said door stile consists of a tubular metal member having a front wall at the meeting line, inner and outer side walls, and a back wall surrounding a hollow center recess for said bolt and lock containing cylinder.

3. The lock and bolt assembly in accordance with that of claim 2, including a protective chassis for em bracing said bolt, and means for securing said protective chassis to said tubular metal member of the stile.

4. The lock and bolt assembly in accordance with that of claim 3, comprising:

1. latching mechanisms for locking said bolt in either of its locked and unlocked positions; and

2. in which said lock is a barrel lock rotatably mounted within said cylinder and having a lever extending therefrom for engagement with said latching mechanisms for releasing the latter and for moving of said bolt from one of its limits of movement to the other.

5. The lock and bolt assembly in accordance with that of claim 4, in which said protective chassis comprises:

l. a pair of side plates;

2. cross webs between the fore edges of said side plates and cross rods between the aft edges thereof for securing said side plates in spaced relation a distance comparable to the thickness of said bolt plus a clearance for embracing the latter;

3. each of said side plates having aligned U shaped slot formations formed thereon from their aft edges to a terminal bight for surrounding said lock containing cylinder and for supporting the latter in axial alignment with the pair of aligned bores in the inner and outer sides of the stile; and

4. means extending from said cross webs to the back wall of said tubular metal stile member for securing said protective chassis with the aft edges of its side plates in abutting relation to said back wall.

6. The lock and bolt assembly in accordance with that of claim 5, in which the U shaped slot formations in said side plates have their parallel leg edges spaced a distance slightly less than the diameter of said lock containing cylinder; and including a pair-of diametrically opposed segmental grooves formed in said lock containing cylinder in spaced relation comparable to that of said side plates for receiving the leg edges of the U shaped slots formed therein for supporting said lock containing cylinder in non-rotative relation relative to said bolt.

7. The lock and bolt assembly in accordance with claim 4 in which said latching mechanisms includes:

1. a spring loaded lever pivotally mounted on said bolt having a widened end engaging said cylinder at limit of spring urged movement and its opposite end notched;

2. a fixed cross ribwithin said stile engageable by the notched end of said spring loaded lever when said bolt is disposed in horizontal, locked condition; and

3. a cam edge on the widened end of said spring loaded lever engageable by the lever extending from the lock confined within said cylinder for releasing the notched end of said spring loaded lever from said fixed cross rib incident to turning of said bolt toward its other limit of movement.

8. The lock and bolt assembly in accordance with that of claim 7 in which said latching mechanisms include:

l. a second fixed rib within said stile;

2. a slide bar arranged for sliding movement transversely of the width of said bolt and have a notched end disposed to engage and latch onto said second fixed rib when said bolt is disposed in vertical, unlocked condition within said stile;

3. spring means between said bolt and said slide bar normally urging the notched end of the latter toward latched engagement with said second fixed rib; and

4. means on said slide bar engageable by the lever extending from the lock confined within said cylinder for urging the notched end of said slide bar away from said second fixed rib against the action of said spring means incident to turning of said bolt toward horizontal, locked condition.

9. The lock and bolt assembly in accordance with claim 6 in which said latching mechanisms includes:

1. a spring loaded lever pivotally mounted on said bolt having a widened end engaging said cylinder at limit of spring urged movement and its opposite end notched;

2. a fixed cross rib within said stile engageable by the notched end of said spring loaded lever when said bolt is disposed in horizontal, locked condition; and

3. a cam edge on the widened end of said spring loaded lever engageable by the lever extending from the lock confined within said cylinder for releasing the notched end of said spring loaded lever from said fixed cross rib incident to turning of said bolt toward its other limit of movement.

10. The lock and bolt assembly in accordance with that of claim 9 in which said latching mechanisms include:

l. a second fixed rib within said stile;

2. a slide bar arranged for sliding movement transversely of the width of said bolt and have a notched end disposed to engage and latch onto said second fixed rib when said bolt is disposed in vertical, unlocked condition within said stile;

3. spring means between said bolt and said slide bar for normally urging the notched end-of the latter toward latched engagement with said second fixed rib; and

4. means on said slide bar engageable by the lever extending from the lock confined within said cylinder for urging the notched end of said slide bar away from said second fixed rib against the action of said spring means incident to turning of said bolt toward horizontal, locked condition.

4 I! i l i 

1. In a closure member, in a wall opening, including a stile having one recessed edge adapted for abuttment with a fixed member provided with a keeper recess for receiving a bolt extending laterally across the meeting line between the stile and fixed member; the combination therewith of a lock and latch bolt assembly comprising:
 1. a pair of aligned bores formed through the inner and outer sides of the stile transversely of the recess therein:
 2. a bolt having a bore formed crosswise its narrower thickness and concentric to one end thereof disposed in the recessed stile in axial alignment with said pair of aligned bores in the stile; and
 3. a lock containing cylinder extending through the bore in said bolt and having each of its ends disposed in a respective one of the axially aligned bores in said stile and fixed thereto for pivotally supporting said bolt means interconnecting the lock and bolt whereby actuation of the lock causes turning movement of the bolt between limits of vertical, unlocked condition within the recessed stile and horizontal, locked condition extending laterally across the meeting line and into the keeper recess of the fixed member.
 2. a bolt having a bore formed crosswise its narrower thickness and concentric to one end thereof disposed in the recessed stile in axial alignment with said pair of aligned bores in the stile; and
 2. a slide bar arranged for sliding movement transversely of the width of said bolt and have a notched end disposed to engage and latch onto said second fixed rib when said bolt is disposed in vertical, unlocked condition within said stile;
 2. a fixed cross rib within said stile engageable by the notched end of said spring loaded lever when said bolt is disposed in horizontal, locked condition; and
 2. a slide bar arranged for sliding movement transversely of the width of said bolt and have a notched end disposed to engage and latch onto said second fixed rib when said bolt is disposed in vertical, unlocked condition within said stile;
 2. a fixed cross rib within said stile engageable by the notched end of said spring loaded lever when said bolt is disposed in horizontal, locked condition; and
 2. cross webs between the fore edges of said side plates and cross rods between the aft edges thereof for securing said side plates in spaced relation a distance comparable to the thickness of said bolt plus a clearance for embracing the latter;
 2. in which said lock is a barrel lock rotatably mounted within said cylinder and having a lever extending therefrom for engagement with said latching mechanisms for releasing the latter and for moving of said bolt from one of its limits of movement to the other.
 2. The lock and bolt assembly in accordance with that of claim 1, in which said door stile consists of a tubular metal member having a front wall at the meeting line, inner and outer side walls, and a back wall surrounding a hollow center recess for said bolt and lock containing cylinder.
 3. a lock containing cylinder extending through the bore in said bolt and having each of its ends disposed in a respective one of the axially aligned bores in said stile and fixed thereto for pivotally supporting said bolt means interconnecting the lock and bolt whereby actuation of the lock causes turning movement of the bolt between limits of vertical, unlocked condition within the recessed stile and horizontal, locked condition extending laterally across the meeting line and into the keeper recess of the fixed member.
 3. each of said side plates having aligned U shaped slot formations formed thereon from their aft edges to a terminal bight for surrounding said lock containing cylinder and for supporting the latter in axial alignment with the pair of aligned bores in the inner and outer sides of the stile; and
 3. The lock and bolt assembly in accordance with that of claim 2, including a protective chassis for embracing said bolt, and means for securing said protective chassis to said tubular metal member of the stile.
 3. a cam edge on the widened end of said spring loaded lever engageable by the lever extending from the lock confined within said cylinder for releasing the notched end of said spring loaded lever from said fixed cross rib incident to turning of said bolt toward its other limit of movement.
 3. spring means between said bolt and said slide bar normally urging the notched end of the latter toward latched engagement with said second fixed rib; and
 3. spring means between said bolt and said slide bar for normally urging the notched end of the latter toward latched engagement with said second fixed rib; and
 3. a cam edge on the widened end of said spring loaded lever engageable by the lever extending from the lock confined within said cylinder for releasing the notched end of said spring loaded lever from said fixed cross rib incident to turning of said bolt toward its other limit of movement.
 4. means on said slide bar engageable by the lever extending from the lock confined within said cylinder for urging the notched end of said slide bar away from said second fixed rib against the action of said spring means incident to turning of said bolt toward horizontal, locked condition.
 4. means on said slide bar engageable by the lever extending from the lock confined within said cylinder for urging the notched end of said slide bar away from said second fixed rib against the action of said spring means incident to turning of said bolt toward horizontal, locked condition.
 4. means extending from said cross webs to the back wall of said tubular metal sTile member for securing said protective chassis with the aft edges of its side plates in abutting relation to said back wall.
 4. The lock and bolt assembly in accordance with that of claim 3, comprising:
 5. The lock and bolt assembly in accordance with that of claim 4, in which said protective chassis comprises:
 6. The lock and bolt assembly in accordance with that of claim 5, in which the U shaped slot formations in said side plates have their parallel leg edges spaced a distance slightly less than the diameter of said lock containing cylinder; and including a pair of diametrically opposed segmental grooves formed in said lock containing cylinder in spaced relation comparable to that of said side plates for receiving the leg edges of the U shaped slots formed therein for supporting said lock containing cylinder in non-rotative relation relative to said bolt.
 7. The lock and bolt assembly in accordance with claim 4 in which said latching mechanisms includes:
 8. The lock and bolt assembly in accordance with that of claim 7 in which said latching mechanisms include:
 9. The lock and bolt assembly in accordance with claim 6 in which said latching mechanisms includes:
 10. The lock and bolt assembly in accordance with that of claim 9 in which said latching mechanisms include: 